radv: implement VK_EXT_shader_image_atomic_int64

The extension is only exposed on ACO and LLVM 11+ because of a LLVM bug.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7234>
6 files changed